| Creo que... | I believe/think (FOR A FACT) that... |
| No hay duda que... | There is no doubt that... |
| Es obvio/ cierto/ verdad/ hecho que.... | It's obvious, certain, true, a fact that... |
| Yo sé que...(tú sabes que...) | I know (FOR A FACT) or You know (FOR A FACT) that.. |
We also do not use the subjunctive when discussing people or things we know exist:
| There is a secretary who can speak Spanish. | Hay una secretaria que habla español. |
| I'm looking for the guy who has the key.
[I know there is such a guy-he exists.] |
Busco al hombre que tiene la llave. |